Electrolyte for rechargeable battery

Abstract

An electrolyte for a rechargeable battery includes 20-70% by volume of at least two cyclic carbonates selected from ethylene carbonate, propylene carbonate, vinylene carbonate or butylenes carbonate, 30-80% by volume of an ester selected from propyl propionate, propyl acetate, butyl acetate or a mixture thereof, and a lithium salt.

1 . An electrolyte for a rechargeable battery comprising: 
 20-70% by volume of at least two cyclic carbonates selected from the group consisting of ethylene carbonate, propylene carbonate, vinylene carbonate and butylenes carbonate;    30-80% by volume of an ester selected from the group consisting of propyl propionate, propyl acetate, butyl acetate, and a mixture thereof; and    a lithium salt.    
     
     
         2 . The electrolyte of  claim 1 , wherein the electrolyte includes 40 to 60% by volume of the cyclic carbonates and 40 to 60% by volume of the ester.  
     
     
         3 . The electrolyte of  claim 1 , wherein the lithium salt is selected from the group consisting of lithium hexafluorophosphate (LiPF 6 ), lithium hexafluoroasenate (LiAsF 6 ), lithium percholate (LiClO 4 ), lithium tetrafluoroborate (LiBF 4 ), lithium trifluoromethanesulfonate (CF 3 SOLi), and a mixture thereof.  
     
     
         4 . The electrolyte of  claim 1 , wherein the concentration of the lithium salt is 0.5 to 2.0M.